CTA Assignment Alert

Feature Enhancement Request: CTA Assignment Alert - When I manually assign, or have built a
playbook with assignments to others and it is initiated, I would like the
assignee to receive a notification that a new CTA has been assigned to them; either
a pop up or email, or both.

You can assist your users via some admin tools:You can assign the customers to users so they are eligible to receive notifications automatically: see here.

That gets you halfway there - the users still have to configure how they want to receive those notifications, but you can run a report to see what users are configured and which are not - use the object "Subscription Preferences" to get this data.